Engineering Materials Practice Set-8

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1. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Nickel

Chromium

Manganese

2. Shock resisting steels should have

Low hardness

Low tensile strength

Toughness

Low wear resistance

3. Permalloy is a

Kind of stainless steel

Nickel and iron alloy having high permeability

Polymer

None ferrous alloy

4. Bronze contains

70% copper and 30% zinc

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

5. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Chromium and nickel

Aluminium and zinc

Tungsten and sulphur

6. Hardness of upper bainite (acicular structure) is about

RC 80

RC 48

RC 57

RC 65

7. Connecting rod is usually made of

Medium carbon steel

High carbon steel

Aluminium

Low carbon steel

8. Which is false statement about tempering? Tempering is done to

Improve toughness

Release stresses

Improve machinability

Improve ductility

9. The alloy used for making electrical resistances and heating elements is

Invar

Elinvar

Nichrome

Magnin

10. Tungsten in high speed steel provides

Hot hardness

Toughness

Wear resistance

Sharp cutting edge

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11. High carbon steel carries carbon percentage

0.3 to 0.6%

0.6 to 0.8%

0.8 to 1.5%

0.1 to 0.3%

12. The presence of sulphur in pig iron makes

The casting unsound

It hard

It brittle

It easily machinable

13. The crystal structure of brass is

H.C.P.

F.C.C.

B.C.C.

Orthorhombic crystalline structure

14. Sulphur in cast iron

Increases hardness and brittleness

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Make the iron white and hard

15. An example of amorphous material is

Zinc

Lead

Silver

Glass

16. Compressive strength of grey cast iron in tonnes/cm is of the order of

710

57

1015

35

17. Cupola produces following material

Malleable iron

Pig iron

Cast iron

Wrought iron

18. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

19. Gun metal contains

90% copper and 10% tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

70 - 78% copper and rest tin

20. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Copper, nickel and antimony

Nickel, copper and iron

Nickel, copper and zinc

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21. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

22. Carbon in iron is an example of

Substitutional solution

Interstitial solid solution

Intermetallic compounds

All of the above

23. Which of the following is the binding material in cemented carbides?

Nickel

Iron

Cobalt

Vanadium

24. Steel made from phosphate iron is

Tough

Brittle

Hard

Ductile

25. The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets

Can be drawn into wires

Can cut another metal

Breaks with little permanent distortion

26. Beryllium bronze has

(D) None of these

(C) Both (A) and (B)

(A) High yield point

(B) High fatigue limit

27. Preheating is essential in welding

Cast iron

All of the above

All nonferrous materials

High speed steel

28. Free cutting steels

Require least cutting force

Contain carbon in free form

Are used where ease in machining is the criterion

Do not exist

29. The hardness of steel increases if it contains

Austenite

Martensite

Pearlite

Cementite

30. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

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31. Phosphor bronze contains

1% phosphorous

2.5% phosphorous

0.5% of phosphorous

None of the above

32. Melting point of iron is

1539°C

1489°C

1712°C

1601°C

33. Manganese in steel increases its

Fluidity

Tensile strength

Ductility

Hardness

34. Nimonic contains __________ percentage of nickel as that of Inconel.

None of these

Less

More

Same

35. Which of the following is used for bearing liner?

Bronze

Bell metal

Gun metal

Babbitt metal

36. Aluminium bronze contains aluminium and copper in the ratio of

40 : 60

50 : 50

60 : 40

10 : 90

37. Cold rolled steel sheets contain carbon of the following order

0.2%

0.4%

0.1%

0.6%

38. Chromium in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

Gives ductility, toughness, tensile strength and anti-corrosion properties

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

39. Argentite is the principal ore or raw material for

Zinc

Aluminium

Tin

Silver

40. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Stainless steel

Mild steel

Engineering Materials Practice Set-8

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